Word: technetium
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Dates: during 1967-1967
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...long-lived radioactive substances can produce short-lived radioactive offspring. The cow consists of an open-ended test tube with various layers of alumina and specially treated glass through which the parent substance is filtered. In the case of a parent such as molybdenum-99 (half-life: 2.8 days), technetium-99m (half-life: 6 hours) is produced, and it accumulates at the bottom of the tube (the cow's udder). The milked technetium can therefore be created only moments before it is put into a patient, and the doctor can scan its internal path while it is most active...
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